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Vincent was previously the pet of Brian Porter in Sydney, Australia, who also lived with Brian's wife Susan, and his adoptive son, Walt. After the death of Walt's mother, Vincent became very important to Walt as he served as a companion that Walt could talk to.

When Michael, Walt's biological father, arrived in Australia to bring Walt back to New York with him, he stated that Brian said Walt could have Vincent. Whether or not Brian actually stated that Walt could have Vincent, or if Michael took it upon himself to get even with Brian by doing so, is unknown.

When the three went to the Sydney Airport to board their flight, Vincent was placed in the luggage compartment.

After the crash of Oceanic Flight 815, Vincent became missing for the first few days. He was first spotted directly after the crash by Jack in the jungle, who later notified Michael that Vincent was still alive. Locke carved a whistle to try and locate Vincent and was successful in doing so. Locke presented Michael with the location of Vincent and stated that since Walt just lost his mother, he felt it should be Michael who presented him with Vincent.

When Vincent wandered into the jungle in Special, Walt ran after him and inadvertently found himself under the attack of a polar bear.

Vincent ran up to Boone in the jungle and licked his face just before the murdered body of Steve would be found on the beach in Homecoming.

When the raft was getting ready to set sail, Walt placed Vincent in the care of Shannon stating that he could help her get over the loss of Boone as he was a good listener. When Shannon lost Vincent, she wandered into the jungle with Sayid to find him and spotted a soaking wet vision of Walt in the middle of the jungle.